sysdeps/mach/_strerror.c

   1 /* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <mach/error.h>
  22 #include <errorlib.h>
  23 #include "../stdio-common/_itoa.h"
  24
  25 /* It is critical here that we always use the `dcgettext' function for
  26    the message translation.  Since <libintl.h> only defines the macro
  27    `dgettext' to use `dcgettext' for optimizing programs this is not
  28    always guaranteed.  */
  29 #ifndef dgettext
  30 # include <locale.h>            /* We need LC_MESSAGES.  */
  31 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  32 #endif
  33
  34 /* Return a string describing the errno code in ERRNUM.  */
  35 char *
  36 _strerror_internal (int errnum, char *buf, size_t buflen)
  37 {
  38   int system;
  39   int sub;
  40   int code;
  41   const struct error_system *es;
  42   extern void __mach_error_map_compat (int *);
  43
  44   __mach_error_map_compat (&errnum);
  45
  46   system = err_get_system (errnum);
  47   sub = err_get_sub (errnum);
  48   code = err_get_code (errnum);
  49
  50   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
  51     {
  52       const char *unk = _("Error in unknown error system: ");
  53       const size_t unklen = strlen (unk);
  54       char *p = buf + buflen;
  55       *--p = '\0';
  56       p = _itoa (errnum, p, 16, 1);
  57       return memcpy (p - unklen, unk, unklen);
  58     }
  59
  60   es = &__mach_error_systems[system];
  61
  62   if (sub >= es->max_sub)
  63     return (char *) es->bad_sub;
  64
  65   if (code >= es->subsystem[sub].max_code)
  66     {
  67       const char *unk = _("Unknown error ");
  68       const size_t unklen = strlen (unk);
  69       char *p = buf + buflen;
  70       size_t len = strlen (es->subsystem[sub].subsys_name);
  71       *--p = '\0';
  72       p = _itoa (errnum, p, 16, 1);
  73       *p-- = ' ';
  74       p = memcpy (p - len, es->subsystem[sub].subsys_name, len);
  75       return memcpy (p - unklen, unk, unklen);
  76     }
  77
  78   return (char *) _(es->subsystem[sub].codes[code]);
  79 }